Use of E7018 instead of E7018-1 - Low Temperature Pipe.

[Richard robes]

Gents,

What all are the practical issues if someone has welded low temperature A333 Gr.6 pipe with wrong electrode E7018 instead of E7018-1.

Regards

Richard

[pgoswami]

Hi Richard,

 

What is the design temperature ?   what was the impact test temperature for PQR qualification vs. the AWS classification used E 7018/E-7018-1?

 

Usually these electrodes are manufactured to meet dual certification i.e,7018/7018-1 and are tested for impact @ -45Deg C. If such electrode is used for production weld then no issues.

 

Otherwise E-7018(certified for impact @-29 Deg C) is not matching to SA 333 Gr6 (guaranteed impact -46 Deg C) base metal.

 

Thanks.

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Specialist

Ontario, Canada

pgos...@quickclic.net

pgos...@sympatico.ca

 

 

---

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Richard robes
Sent: Sunday, February 16, 2014 9:59 PM
To: material...@googlegroups.com
Subject: [MW:20114] Use of E7018 instead of E7018-1 - Low Temperature Pipe.

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[Richard robes]

Hi,

Design Temperature is  -45°C, Electrode used is E7018 with -40°C impact tested. 

Regards

Richard
 

[kannayeram gnanapandithan]

E7018 is not suitable below minus 29deg. Use only E7018-1 which is suitable up to minus 45

THANKS & BEST REGARDS

KG.PANDITHAN, AWS-CWI, CSWIP 3.1

CONSULTANT-WELDING & QUALITY